/*$(document).scroll(function(){
	
	var baseheight=$(document).scrollTop()+280;
	alert(baseheight);
	
	if(baseheight<128){
		$(".list_head").removeClass("list-header-fixed");	
		$(".list_head1").removeClass("list-header-fixed");
		$(".list_head2").removeClass("list-header-fixed");	
		$(".list_head3").removeClass("list-header-fixed");	
		$(".list_head4").removeClass("list-header-fixed");	
	}
	
	if(baseheight>128&&$(".list_head").position().top-baseheight<0){
		$(".list_head").addClass("list-header-fixed");
		$(".list_head1").removeClass("list-header-fixed");	
		$(".list_head2").removeClass("list-header-fixed");	
		$(".list_head3").removeClass("list-header-fixed");	
		$(".list_head4").removeClass("list-header-fixed");	
		
	}
	if(baseheight>128&&$(".list_head1").position().top-baseheight<0){
		$(".list_head1").addClass("list-header-fixed");
		$(".list_head").removeClass("list-header-fixed");	
		$(".list_head2").removeClass("list-header-fixed");	
		$(".list_head3").removeClass("list-header-fixed");	
		$(".list_head4").removeClass("list-header-fixed");	
	}
		
	if(baseheight>128&&$(".list_head2").position().top-baseheight<0){
			$(".list_head2").addClass("list-header-fixed");
			$(".list_head1").removeClass("list-header-fixed");	
			$(".list_head").removeClass("list-header-fixed");	
			$(".list_head3").removeClass("list-header-fixed");	
			$(".list_head4").removeClass("list-header-fixed");	
		}
	if(baseheight>128&&$(".list_head3").position().top-baseheight<0){
			$(".list_head3").addClass("list-header-fixed");
			$(".list_head1").removeClass("list-header-fixed");	
			$(".list_head").removeClass("list-header-fixed");	
			$(".list_head2").removeClass("list-header-fixed");	
			$(".list_head4").removeClass("list-header-fixed");	
		}
	if(baseheight>128&&$(".list_head4").position().top-baseheight<0){
		$(".list_head4").addClass("list-header-fixed");
			$(".list_head1").removeClass("list-header-fixed");	
			$(".list_head").removeClass("list-header-fixed");	
			$(".list_head3").removeClass("list-header-fixed");	
			$(".list_head2").removeClass("list-header-fixed");	
	}
	
})
*/